I'm with general consensus that almost everyone has the physical capability. With proper instruction and technique (and occassionally some bike mods), it is easy enough for almost anyone with the desire to learn and the right mental approach.
But that is the catch. People could have a mental block or fears that hold them back. My wife, who is physically capable of riding, has a healthy fear that blocks her combined with lack of patience to learn. She'll never be able to ride.
Seemed like a good place to put this:
Link to original page on YouTube.
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"Improvement makes straight roads, but the crooked roads without improvement, are roads of genius." — William Blake